Okay, I managed to launch a Terminal by patching Packer to enable the Menu key to be pressed when the ISO boots, so I can now navigate into a bash session and enter some commands in an automated fashion!
Could we get more details for the exact commands necessary to install Haiku onto a given partition? I cobbled together this script, but when I reboot instead of a fresh Haiku install, VirtualBox just says
Not a directory against a black screen.
Or, could someone help me find the source code behind the Installer GUI, so that I can replicate its behavior from bash?